System identification of Thermal Conductivity-sensing module for improvement of H2-concentration prediction

摘要: The last years a TC-sensing module called HSS-440 has been developed at AppliedSensor. sensor is used in hydrogen powered cars to detect H2-leakages. technique that uses small changes thermal conductivity when H2 present determine concentrations. Today these are estimated with prediction model several hundreds of parameters. A substrate from new manufacturer now introduced. This means an opportunity look over the current solution. task for this thesis investigate system properties and solutions regarding minimal need calibration. System investigated relations heat flow influence established. In process earlier not known nonlinearity proved exist. From this, open loop nonlinear greybox concluded improve model. then closed implemented PI-regulator be useful H2-predictions. also utilizes 11 parameters instead which big improvement.